Flexographic Printing Blanket Carrier Layer Design
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Solution Overview
Problem
Flexographic printing blankets with fabric reinforcement layers face issues of dimensional instability, uneven surface leading to weak adhesion, and swelling due to ink absorption, which affects print quality and adhesion strength.
Innovation Solution
A printing blanket design featuring a carrier layer made of plastic or metal film with a smooth surface, eliminating air pockets and cavities, and an adhesive layer applied directly to the printing cylinder, ensuring improved dimensional stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fabric second reinforcing layer is used, then dimensional stability in height and width is improved, but the fabric loses thickness and sags under use due to air pockets being forced out
Solution Approach 1:
The patent changes the material parameter from fabric (natural or synthetic fibers) to a foam material with closed-cell structure. This parameter change eliminates air pockets while maintaining dimensional stability, as the foam's closed-cell structure prevents thickness loss through compression or sagging during use.
Solution Approach 2:
The patent uses a composite structure combining a foam material (second reinforcing layer) with a fabric first reinforcing layer. This composite approach provides both dimensional stability from the foam and flexibility from the fabric, resolving the contradiction between stability and reliability.
2Stability of the object's composition
If a woven fabric second reinforcing layer is used, then dimensional stability is improved, but the surface becomes uneven causing point contact with adhesive layer and weakening adhesion
Solution Approach 1:
The patent changes the surface topology parameter from woven fabric (uneven, wavy surface) to foam material (smooth, even surface). This parameter change ensures uniform contact between the second reinforcing layer and adhesive layer, maximizing adhesive strength while maintaining dimensional stability.
3Stability of the object's composition
If a porous fabric second reinforcing layer is used, then dimensional stability is improved, but liquids penetrate causing swelling and uneven thickness
Solution Approach 1:
The patent changes the porosity parameter from porous fabric (open structure allowing liquid penetration) to closed-cell foam material (closed structure preventing liquid penetration). This parameter change prevents ink and liquids from penetrating and causing swelling, while maintaining dimensional stability.
Solution Approach 2:
The patent converts the potential harm of a non-porous structure (which would block ink transfer) into a benefit by using closed-cell foam that prevents liquid penetration while allowing controlled ink transfer through the top layer's relief structure.
4Stability of the object's composition
If fabric fibers are used in the second reinforcing layer, then dimensional stability is improved, but air pockets cause compression and thickness loss under stress
Solution Approach 1:
The patent changes the internal structure parameter from fibrous (with air pockets) to closed-cell foam. This parameter change eliminates air pockets that cause compression and thickness loss, while maintaining dimensional stability through the foam's rigid closed-cell structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the adhesive connection between the printing blanket and cylinder, maintaining print quality and extending the service life of the printing blanket by preventing swelling and maintaining dimensional stability.
Implementation Method 1
an adhesive layer can be applied to the underside of the printing blanket, such as the inner surface of the second reinforcing layer (i.e., the inner side of the printing blanket facing the printing cylinder). This adhesive layer, upon contact, forms a metallurgical bond with the outer surface of the printing cylinder.
Data Source
Figure 1~2
AI summary
The invention relates to an ink transfer medium (1), in particular a printing blanket (1), in particular a printing blanket (1) for flexography, comprising a top layer (10) for transferring an ink by means of a printing side (11) and an adhesive layer (16) for fastening the ink transfer medium (1) to a substratum, in particular to a cylinder of a printing machine. The ink transfer medium (1) is characterized by a carrier layer (15), which is arranged between the top layer (10) and the adhesive layer (16), wherein the adhesive layer (16) is arranged directly on the side of the carrier layer (15) facing away from the printing side (11), wherein the carrier layer (15) is a film (15).